// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: http://codemirror.net/LICENSE

(function(mod) {
  if (typeof exports == 'object' && typeof module == 'object')
    // CommonJS
    mod(require('../../lib/codemirror'));
  else if (typeof define == 'function' && define.amd)
    // AMD
    define(['../../lib/codemirror'], mod);
  // Plain browser env
  else mod(CodeMirror);
})(function(CodeMirror) {
  'use strict';

  var WORD = /[\w$]+/,
    RANGE = 500;

  CodeMirror.registerHelper('hint', 'anyword', function(editor, options) {
    var word = (options && options.word) || WORD;
    var range = (options && options.range) || RANGE;
    var cur = editor.getCursor(),
      curLine = editor.getLine(cur.line);
    var end = cur.ch,
      start = end;
    while (start && word.test(curLine.charAt(start - 1))) --start;
    var curWord = start != end && curLine.slice(start, end);

    var list = (options && options.list) || [],
      seen = {};
    var re = new RegExp(word.source, 'g');
    for (var dir = -1; dir <= 1; dir += 2) {
      var line = cur.line,
        endLine =
          Math.min(Math.max(line + dir * range, editor.firstLine()), editor.lastLine()) + dir;
      for (; line != endLine; line += dir) {
        var text = editor.getLine(line),
          m;
        while ((m = re.exec(text))) {
          if (line == cur.line && m[0] === curWord) continue;
          if (
            (!curWord || m[0].lastIndexOf(curWord, 0) == 0) &&
            !Object.prototype.hasOwnProperty.call(seen, m[0])
          ) {
            seen[m[0]] = true;
            list.push(m[0]);
          }
        }
      }
    }
    return { list: list, from: CodeMirror.Pos(cur.line, start), to: CodeMirror.Pos(cur.line, end) };
  });
});
